Filament spool



FIG. 1 is a top perspective view of a design for a filament spool;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and

FIG. 8 is a bottom perspective view thereof.

FIG. 9 is a top perspective view of a design for a filament spool;

FIG. 10 is a front view thereof;

FIG. 11 is a rear view thereof;

FIG. 12 is a left side view thereof;

FIG. 13 is a right side view thereof;

FIG. 14 is a top view thereof;

FIG. 15 is a bottom view thereof; and,

FIG. 16 is a bottom perspective view thereof.

The broken lines in the drawings depict portions of the filament spool that form no part of claimed design. 

CLAIM The ornamental design for a filament spool, as shown and described. 